Where does “terrastirappaus” come from?

terrastirappaus (Finnish) comes from Finnish rappaus, from Finnish räpätä, from Swedish rappa, from German berappen.

terrastirappaus (Finnish): rendering or plastering with a kind of mineral plaster containing crushed glass, bits of colored mineral, etc

Definitions

rendering or plastering with a kind of mineral plaster containing crushed glass, bits of colored mineral, etc

terrastirappaus traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Finnish	rappaus	plastering covering of plaster
2	Finnish	räpätä	to rap; to tap, hit lightly; to get it
3	Swedish	rappa	to rap; to speak lyrics in the style of rap music
4	German	berappen	—

Step	Language	Word	Meaning
1	Finnish	terrasti	a kind of mineral plaster with multicolored bits of mineral, glass, etc
2	Swedish	terrast	—